then I can shift-click to select 'cat' & 'dog' or 'elephant' & 'flea', but I apparently cannot select just 'cat' & 'flea'. If I click on 'cat' and then shift-click on 'flea', 'dog' and 'elephant' get selected too.

I hope this is a bug and can be fixed, because it's not very useful as it stands.

(First real problem I've had with Bolt, though - it's been doing really well up to now - easy to use, comprehensible, and robust. Thanks guys.)